How to Use Chord Calculator
The Chord Calculator converts a root note and chord quality into the notes that make up the chord. It is a compact music-theory lookup for triads and seventh chords.
- Choose the root note, such as C, F#, or A.
- Choose the chord type: major, minor, dominant seventh, major seventh, minor seventh, diminished, or augmented.
- Read the note list in the result panel. The interval pattern shows the semitone distances used to build the chord.
- Try different chord types with the same root to hear how the third, fifth, or seventh changes the color.
Formula & Theory - Chord Calculator
The Chord Calculator uses the following formula or calculation model:
Chord notes = root note + chord interval pattern
Major triad = [0, 4, 7]
Minor triad = [0, 3, 7]
Dominant seventh = [0, 4, 7, 10]Western chord spelling can become complex when flats, double sharps, and key context are considered. This calculator focuses on quick pitch-class lookup and displays enharmonic notes using sharps. It is especially useful when the goal is to identify the sounding notes rather than produce formal notation spelling.
Assumptions and Limits
For classical notation or key-specific spelling, you may need enharmonic names such as Eb instead of D#.
Use Cases for Chord Calculator
Specific use cases include:
- Check the notes of a chord while practicing piano, guitar, or bass.
- Write a quick lead sheet or MIDI part.
- Compare major, minor, diminished, and augmented sonorities.
- Teach chord construction from semitone intervals.